Knife block



FIG. 1 is a perspective of a knife block as seen from the upper left front showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof, the right side being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines in FIGS. 1, 2 and 4 of the knife block are for the purpose of illustrating portions of the article and form no part of the claimed design. 

The ornamental design for a knife block, as shown and described. 